4 IIs last cycle but no acceptance - is interview practice all I need?

Hi guys, Despite submitting pretty late (complete mid September) I was fortunate to receive 4 IIs to mid-tier MD schools this past cycle (Tufts, UMass, Dartmouth, Einstein). Unfortunately, I've been striking out post-interview - 3 Rs (Tufts initially deferred me but rejected today) and still waiting on Einstein, but not feeling confident. I'm preparing to reapply next year, but my stats are pretty solid (3.7/517) and I have strong research and have checked boxed for clinical experience and... 4 IIs last cycle but no acceptance - is interview practice all I need?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums